[CMake] Colored diagnostic output for GCC 4.9 through Ninja

[Miller Henry]

I do something like this, which works for clang and should work for gcc 4.9 though I haven't tested it.   I haven't wrote the right way to do this which is to check if the terminal supports color before passing the flag in. I don't know what will happen on our e.g. CI system which doesn't support color.

macro(AddCXXFlagIfSupported flag test)
   CHECK_CXX_COMPILER_FLAG(${flag} ${test})
   if( ${${test}} )
      message("adding ${flag}")
      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${flag}")
   endif()
endmacro()

if("Ninja" STREQUAL ${CMAKE_GENERATOR})
   AddCXXFlagIfSupported(-fcolor-diagnostics COMPILER_SUPPORTS_fcolor-diagnostics)
endif()

P.s. AddCXXFlagIfSupported ought to be in the default cmake distribution along with a lot or similar things

-----Original Message-----
From: CMake [mailto:cmake-bounces at cmake.org] On Behalf Of Robert Dailey
Sent: Wednesday, October 28, 2015 8:43 AM
To: CMake
Subject: [CMake] Colored diagnostic output for GCC 4.9 through Ninja

I'm using CMake + Ninja against GCC 4.9 in the Android NDK. I'm on Windows, invoking 'ninja' through CMD.exe.

I do not see colored output for diagnostics (errors, warnings, etc) GCC gives. Is there something in CMake I need to configure to enable colored output?
-- 

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